Commodore VIC-20 General Maintenance: Difference between revisions
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[[File:VIC20_Logic_Board.jpg|thumb|450px|Commodore VIC-20 motherboard (Assy 250403, 1982).]] | [[File:VIC20_Logic_Board.jpg|thumb|450px|Commodore VIC-20 motherboard (Assy 250403, 1982).]] | ||
The '''Commodore VIC-20''' (a.k.a. ''VC-20 / VIC-1001'') was the first home computer to sell more than a million units. Although far simpler than later 8-bit machines, four decades of heat, dust, and leaking components can | The '''Commodore VIC-20''' (a.k.a. ''VC-20 / VIC-1001'') was the first home computer to sell more than a million units. Although far simpler than later 8-bit machines, four decades of heat, dust, and leaking components can destroy a VIC-20. | ||
This '''General Maintenance Guide''' walks through cleaning, power-supply care, keyboard service, capacitor replacement, and other longevity tips specific to the VIC-20. | This '''General Maintenance Guide''' walks through cleaning, power-supply care, keyboard service, capacitor replacement, and other longevity tips specific to the VIC-20. | ||
== | == Regular Cleaning == | ||
=== Internal Cleaning === | === Internal Cleaning === | ||
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* For yellowed ABS, follow the [[Retrobrite]] procedure. | * For yellowed ABS, follow the [[Retrobrite]] procedure. | ||
== | == Power Supply & Regulator Care == | ||
=== The “Silver Brick” PSU === | === The “Silver Brick” PSU === | ||
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Check electrolytics '''C12/C13''' (5 V filter) and '''C48''' (12 V filter) for bulging. | Check electrolytics '''C12/C13''' (5 V filter) and '''C48''' (12 V filter) for bulging. | ||
== | == Capacitor Replacement (Recap) == | ||
A VIC-20 contains ~25 electrolytics; most live in a cool environment and age well, '''except''' the two next to the regulators and RF modulator. | A VIC-20 contains ~25 electrolytics; most live in a cool environment and age well, '''except''' the two next to the regulators and RF modulator. | ||
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''Use low-ESR 105 °C caps (Nichicon UPW/UHW, Panasonic FR/FC).'' | ''Use low-ESR 105 °C caps (Nichicon UPW/UHW, Panasonic FR/FC).'' | ||
== | == Keyboard & Joystick Ports == | ||
=== Mitsumi “Full-Travel” Keyboard === | === Mitsumi “Full-Travel” Keyboard === | ||
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* Avoid abrasion (ink erasers) — gold flash is thin. | * Avoid abrasion (ink erasers) — gold flash is thin. | ||
== | == Video / VIC-I Chip Thermal Care == | ||
{| class="wikitable" style="width:60%; text-align:center;" | {| class="wikitable" style="width:60%; text-align:center;" | ||
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* If video shows '''checkerboard or jail-bars''', recap the modulator (C212) and verify VIC 14 MHz crystal. | * If video shows '''checkerboard or jail-bars''', recap the modulator (C212) and verify VIC 14 MHz crystal. | ||
== | == Voltage / Clock Test Points == | ||
{| class="wikitable styled-table" style="width:65%; text-align:center;" | {| class="wikitable styled-table" style="width:65%; text-align:center;" | ||
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Use an oscilloscope or frequency counter; jitter over ±0.01 MHz indicates crystal or cap C7 drift. | Use an oscilloscope or frequency counter; jitter over ±0.01 MHz indicates crystal or cap C7 drift. | ||
== | == Common Faults Checks == | ||
{| class="wikitable styled-table" style="width:100%;" | {| class="wikitable styled-table" style="width:100%;" | ||
! Symptom !! Likely Cause !! First Checks | ! Symptom !! Likely Cause !! First Checks | ||
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|} | |} | ||
== | == Recommended Tool Kit == | ||
* T-15 Torx & Phillips drivers | * T-15 Torx & Phillips drivers | ||
* ESD wrist-strap | * ESD wrist-strap | ||
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* Diagnostic cartridge (VIC-20 Dead Test, Penultimate +/Final Expansion) | * Diagnostic cartridge (VIC-20 Dead Test, Penultimate +/Final Expansion) | ||
== | == Further Resources == | ||
* '''Commodore VIC-20 | * '''[[Commodore VIC-20 Technical Manual]]''' (314001-02) – schematics & waveforms. | ||
* '''VIC-20 Field Service Test Cartridge''' – RAM/ROM and sound loops. | * '''VIC-20 Field Service Test Cartridge''' – RAM/ROM and sound loops. | ||
* [[Commodore VIC-20 Capacitor Replacement Guide]] | * [[Commodore VIC-20 Capacitor Replacement Guide]] | ||
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[[Category:Commodore Systems]] | [[Category:Commodore Systems]] | ||
[[Category: | [[Category:Maintenance Guides]] | ||